Remove/add panel to applet speedy in 1.3.x; painfully slow in 1.4.1/2.beta

The following code (which was working for years, including even 1.3.x) suddenly fails in 1.4.1 and 1.4.2beta on both win 2000 and win xp
DESCRIPTION OF PROBLEM :
An applet consists of 2 components: a contents panel and a button. The contents panel consists of one of several panels of components which are swapped at run-time. The first time a panel is added, the applet works fine, but subsequent additions of the "cached" panel cause 1.4.1 and 1.4.2beta to go to 100% utilization and take 10 seconds before properly displaying the panel.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Load applet described above (and whose short complete example is reproduced below), then click on button "Swap Contents". Each click should swap the contents between 2 panels very quickly. 1.3.x releases did all swaps quickly as expected. Suddenly, in 1.4.1 and 1.4.2beta, the first click is fine, but subsequent clicks are painfully slow.
---------- BEGIN SOURCE ----------
// Java code to reproduce bug followed by html file to load applet
import java.awt.*;
import java.awt.event.*;
public class TestRemoveAddApplet extends java.applet.Applet {
Container contentPanel = new Panel();
Button button = new Button("Swap contents");
Panel contents1 = new Panel();
Panel contents2 = new Panel();
Label contentsL1 = new Label("Contents #1");
Label contentsL2 = new Label("Contents #2");
Component current = contents2;
public void init() {
setLayout(new BorderLayout());
add(contentPanel,"Center");
add(button,"South");
button.addActionListener(new Swap());
contents1.add(contentsL1);
contents2.add(contentsL2);
// initialize contents
swapContents();
class Swap implements ActionListener {
public void actionPerformed(ActionEvent e) {
swapContents();
void swapContents() {
current = (current == contents1 ? contents2 : contents1);
// remove contents of previous contents panel
contentPanel.removeAll();
// display new contents
contentPanel.add(current);
validate();
HTML file follows:
<HTML>
<HEAD>
<TITLE>Test Remove / Add in Applet</TITLE>
</HEAD>
<BODY>
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
WIDTH = 100% HEIGHT = 100% >
<PARAM NAME = CODE VALUE = "TestRemoveAddApplet" >
<PARAM TYPE = "application/x-java-applet;version=1.1" >
</OBJECT>
</BODY>
</HTML>
---------- END SOURCE ----------

Try hiding the panels first then adding them then show. I know its crazy but I have gotten better performance this way with 1.4.1x. Try it.
current.setVisible(false);
contentPanel.add(current);
current.setVisible(false);

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